The NIH featured research on the affect of bedtime and sleep duration on academic and emotional outcomes for teens on their website, which used data from the National Longitudinal Study of Adolescent to Adult Health.

Using data from the National Longitudinal Study of Adolescent Health, researchers from the University of North Carolina at Chapel Hill observed the apparent occurrence of virgin pregnancy and birth. The research team of Amy H. Herring, Samantha M. Attard, Penny Gordon-Larsen, and Carolyn T. Halpern, with the assistance of Reverend William H. Joyner, analyzed self-reports of pregnancy and sexual initiation. They found that 36 young women who consistently reported having never had sexual intercourse also reported giving birth during the same period. Such “virgin births” were associated with signing chastity pledges and absent or poor parental communication about sex and birth control.